Which of the following is an example of an identity?
1) x^2+2x+8=(x+2)(x+4)
2) 2x(x-3)+5x-15=(2x+5)(x-3)
3) x^2+9=(x+3)^2
4) x^3+8=(x+2)(x^2+4)
Pleeeaas help mee:( I’ve been struggling all day

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Find the amplitude of a sinusoidal function that models this temperature variation

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.